Ozone Non-Attainment

Contact: Annette Switzer, 517-284-6803
Agency: Environmental Quality

The United States Environmental Protection Agency (USEPA) published ozone non-attainment designations for the 2015 National Ambient Air Quality Standard (NAAQS) in the federal register on June 4, 2018, with an effective date of August 3, 2018. Michigan is among the states with areas designated as non-attainment with the 2015 ozone standard. The counties that were designated as non-attainment are Berrien, Livingston, Macomb, Monroe, Oakland, St. Clair, Washtenaw, and Wayne. In addition, portions of Allegan and Muskegon Counties were designated as non-attainment. Ozone non-attainment areas are classified based on the severity of their ozone concentrations. All areas in Michigan are classified as marginal non-attainment, which is the lowest level of classification and means that ozone concentrations are less than 10 parts per billion (ppb) above the standard.

Ozone Non-Attainment Designation Map

State Implementation Plan Status

The Air Quality Division is starting the State Implementation Plan (SIP) process for ozone. Staff are currently working to assess possible strategies for reducing ozone pollution in the non-attainment areas. At this time, there are no formal stakeholder workgroups for ozone non-attainment strategies, but as SIP development progresses, these groups may be formed. For more information regarding this please contact Erica Wolf at 517‑284‑6766 or Trace McDonald at 517-284-6756; or visit our SIP and Attainment Website.

Non-Attainment New Source Review

Non-attainment New Source Review may be required in the permitting of new or modified source of air emissions located in the non-attainment areas. To be subject to these regulations, a facility must already be or will become a major emitting source (greater than 100 tons per year) of volatile organic compounds (VOC) or oxides of nitrogen (NOx), which are precursors for ozone. VOC and NOx are regulated under Prevention of Significant Deterioration (PSD) and Non-Attainment New Source Review (NSR) Regulations. Non-Attainment New Source Review requires that a company demonstrate that the proposed project meets the Lowest Achievable Emission Rate (LAER), provides offsets for each precursor at a ratio of 1 to 1.1, and conducts an alternative site analysis. In addition to those requirements, all sources in the state owned by that entity must be in compliance. The Air Quality Division has provided some resources below for facilities preparing an application for Non-Attainment New Source Review.

If you are preparing a PTI application that includes Non-Attainment New Source Review, it is recommended that you schedule a pre-application meeting. Please contact Annette Switzer at 517‑284‑6803 to schedule a pre-application meeting or to ask any questions regarding Non-Attainment New Source Review applications.